Review on Dorman 674-831 Exhaust Manifold with Integrated Catalytic Converter, Non-CARB Compliant, Black - Boost Your Engine Performance by Christopher Wiggins

Easy to install, just removing the A/C compressor. NOx and CO are lower than last year with OE cat. The kit corresponds exactly to the old part. Looks high quality. Be sure to use new mounting nuts and bolts and lubricate them before installation. Cat comes with new downpipe bolts. I also installed new Denso oxygen sensors and coils/spark plugs. I also replaced the rear coil but that's another review (Dorman 674-830), I'm planning on getting an aftermarket sport exhaust soon (Magnaflow Borla etc), the sound is good with them and the original muffler. Seems to be louder than before but I drove with a partially congested one for a while my memory was fuzzy.